Shift control apparatus of continuously variable transmission

Abstract

A shift control apparatus of a continuously variable transmission is provided which is capable of preventing longitudinal belt slip without excessively limiting the target gear ratio. A final target gear ratio based on the operative status is obtained through calculations performed by a target primary revolution-setting section, a final target gear ratio-calculating section, and a shift speed-calculating section. A target gear ratio per predetermined time interval is set while the gear ratio is changed to the final target gear ratio. A stroke limit gear ratio is obtained through calculations performed by a stroke limit speed-calculating section, a stroke variation-calculating section, and a stroke limit gear ratio-calculating section. A switching section outputs a smaller one of the target gear ratio and the stroke limit gear ratio as a control target gear ratio when a control range discriminating section determines that the operative state lies in a predetermined control range at the start of a vehicle.

Dependencies are inferred from the claim text.